fix flake8 warnings
fix flake8 warnings

jcoady9/beets,SusannaMaria/beets,Kraymer/beets,madmouser1/beets,jackwilsdon/beets,pkess/beets,swt30/beets,lengtche/beets,shamangeorge/beets,Freso/beets,parapente/beets,lengtche/beets,MyTunesFreeMusic/privacy-policy,Freso/beets,beetbox/beets,jcoady9/beets,Kraymer/beets,mried/beets,lengtche/beets,parapente/beets,ibmibmibm/beets,jackwilsdon/beets,shamangeorge/beets,beetbox/beets,MyTunesFreeMusic/privacy-policy,swt30/beets,diego-plan9/beets,jackwilsdon/beets,diego-plan9/beets,sampsyo/beets,mosesfistos1/beetbox,mried/beets,mried/beets,madmouser1/beets,ibmibmibm/beets,xsteadfastx/beets,lengtche/beets,LordSputnik/beets,Freso/beets,artemutin/beets,pkess/beets,LordSputnik/beets,LordSputnik/beets,jcoady9/beets,SusannaMaria/beets,MyTunesFreeMusic/privacy-policy,sampsyo/beets,jcoady9/beets,madmouser1/beets,shamangeorge/beets,xsteadfastx/beets,mosesfistos1/beetbox,beetbox/beets,swt30/beets,sampsyo/beets,mosesfistos1/beetbox,pkess/beets,diego-plan9/beets,shamangeorge/beets,SusannaMaria/beets,Kraymer/beets,parapente/beets,artemutin/beets,diego-plan9/beets,Kraymer/beets,artemutin/beets,LordSputnik/beets,jackwilsdon/beets,mried/beets,swt30/beets,pkess/beets,ibmibmibm/beets,mosesfistos1/beetbox,ibmibmibm/beets,madmouser1/beets,beetbox/beets,xsteadfastx/beets,MyTunesFreeMusic/privacy-policy,xsteadfastx/beets,sampsyo/beets,artemutin/beets,SusannaMaria/beets,parapente/beets,Freso/beets